Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Category
Organic (Geological Relative)
Browse organic (geological relative) specimens identified by the Rock Identifier community.
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Pumice
Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)
Igneous
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Quartz-rich)
Microcrystalline Silica (SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Metamorphosed quartz sandstone
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Metamorphosed Quartz Sandstone)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Chert (specifically Gray Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Banded Agate (likely Carnelian Agate or Sardonyx)
Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.
Sedimentary Rock (technically a variety of Chalcedony)
Goethite (likely as part of Limonite/Ironstone)
Goethite (α-FeOOH)
Mineral
Serpentine
Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)
Mineral, often found as a rock
Himalayan Salt
Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.
Mineral
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Laterite (iron-rich nodule, possibly Bauxite as a subtype)
Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)
Sedimentary
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz / Chert
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Schist (Biotite Schist)
Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Chert (Nodular flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Limestone
Sedimentary Rock (Primarily Calcite: CaCO3)
sedimentary